Image charge screening: a new approach to enhance magnetic ordering temperatures

S. Altieri; M. Finazzi; H. H. Hsieh; M. W. Haverkort; H. -J. Lin; C. T. Chen; S. Frabboni; G. C. Gazzadi; A. Rota; S. Valeri; L. H. Tjeng

doi:10.1103/PhysRevB.79.174431

Image charge screening: a new approach to enhance magnetic ordering temperatures

Materials Science 2009-05-29 v1 Strongly Correlated Electrons

Authors: S. Altieri , M. Finazzi , H. H. Hsieh , M. W. Haverkort , H. -J. Lin , C. T. Chen , S. Frabboni , G. C. Gazzadi , A. Rota , S. Valeri , L. H. Tjeng

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Abstract

We have tested the concept of image charge screening as a new approach to enhance magnetic ordering temperatures and superexchange interactions in ultra thin films. Using a 3 monolayer NiO(100) film grown on Ag(100) and an identically thin film on MgO(100) as model systems, we observed that the Neel temperature of the NiO film on the highly polarizable metal substrate is 390 K while that of the film on the poorly polarizable insulator substrate is below 40 K. This demonstrates that screening by highly polarizable media may point to a practical way towards designing strongly correlated oxide nanostructures with greatly improved magnetic properties.

Keywords

thin films thin film physics thin film magnetism

Cite

@article{arxiv.0806.1710,
  title  = {Image charge screening: a new approach to enhance magnetic ordering temperatures},
  author = {S. Altieri and M. Finazzi and H. H. Hsieh and M. W. Haverkort and H. -J. Lin and C. T. Chen and S. Frabboni and G. C. Gazzadi and A. Rota and S. Valeri and L. H. Tjeng},
  journal= {arXiv preprint arXiv:0806.1710},
  year   = {2009}
}

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5 pages, 4 figures

Image charge screening: a new approach to enhance magnetic ordering temperatures

Abstract

Keywords

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